Outfit recommendation using recurrent neural networks

ABSTRACT

Techniques are generally described for performing outfit recommendation using a recurrent neural network. In various examples, a computing device may receive a first state vector representing an outfit comprising at least one article of clothing. First image data depicting a second article of clothing of a first clothing category may be received. A recurrent neural network may generate a first output feature vector based on the first state vector, the first image data and the first clothing category. The first output feature vector may be compared to other feature vectors representing other articles of clothing in the first category to determine distances between the first output feature vector and the other feature vectors. A set of articles of clothing may be recommended based on the distances between the first output feature vector and the other feature vectors.

BACKGROUND

Assembling different clothing items into outfits that have a pleasing visual appearance is the subject of countless fashion magazines, blogs and social commentary. Additionally, systems have been proposed for matching an article of clothing with another complementary article of clothing based upon similarities in the articles of clothing and/or prior pairings of the two articles of clothing together. Websites may recommend clothing items based on other similar items that a user has searched for, viewed and/or purchased in the past.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 depicts a system effective to perform outfit recommendation using a recurrent neural network, in accordance with various embodiments of the present disclosure.

FIG. 2A depicts an example recurrent neural network effective to perform outfit recommendation, in accordance with various aspects of the present disclosure.

FIG. 2B depicts another example of a recurrent neural network effective to perform outfit recommendation, in accordance with various aspects of the present disclosure.

FIG. 3 depicts a loss function that may be minimized in accordance with the outfit recommendation techniques described herein.

FIG. 4 is a block diagram depicting an example architecture of a computing device that may be used in accordance with various aspects of the present disclosure.

FIG. 5 depicts a flowchart illustrating an example process for performing recurrent neural network outfit recommendation, in accordance with various embodiments of the present disclosure.

FIG. 6 depicts a flowchart illustrating another example process for performing recurrent neural network outfit recommendation, in accordance with embodiments of the present disclosure.

FIG. 7 depicts an example system for sending and providing data over a network, in accordance with various embodiments of the present disclosure.

DETAILED DESCRIPTION

In the following description, reference is made to the accompanying drawings which illustrate several embodiments of the present invention. It is understood that other embodiments may be utilized and mechanical, compositional, structural, electrical operational changes may be made without departing from the spirit and scope of the present disclosure. The following detailed description is not to be taken in a limiting sense, and the scope of the embodiments of the present invention is defined only by the claims of the issued patent.

In typical situations, people manually select clothing items that are visually appealing when grouped together into an outfit. For example, a person may select a shirt that matches a particular pair of pants owned by the person. The shirt may be selected from the person's wardrobe, from a store, from an image, and/or from an online source (e.g., an e-commerce site). Additionally, in some examples, computer-implemented algorithms have been used to match particular items of clothing. In accordance with embodiments described herein, a user may select one or more articles of clothing as a starting point and may request that an outfit recommendation system recommend articles of clothing in a particular category. For example, the user may select an image of a shirt as a starting point and may request that the outfit recommendation system recommend a pair of pants to go with the shirt. Next, the user may request that the outfit recommendation system recommend clothing items from other clothing categories for the current outfit of the selected shirt and recommended pants. The outfit recommendation system may recommend a set of clothing articles from the category selected by the user. For example, if the user requests recommendations for scarves for an outfit that currently comprises a shirt and pants, the outfit recommendation system may recommend a set of scarves (e.g., 5, 10, 20, 50, 23, etc.) that have been determined as the top matches for the particular shirt and pants. Further, the outfit recommendation techniques described herein may use state information to monitor the current state of an outfit z, so that recommendations for new categories of clothing may be generated based on all previously selected items of the outfit.

An outfit may be a grouping of two or more clothing items. Image data depicting clothing items and/or outfit accessories may be stored in one or more memories. Generally, as used herein, “article of clothing” and/or “clothing item” may refer to both clothing (e.g., shirts, dresses, pants, shoes) as well as clothing accessories (e.g., belts, jewelry, scarves, gloves, wearable electronics, etc.). Additionally, in some examples, other data may be stored in association with an image of a particular article of clothing data stored in a memory. For example, a label describing a category of the article of clothing (e.g., pants, shirt, hat, dress, sweater, jewelry etc.) may be stored in the memory in association with the image of the article of clothing. Additionally, in various other examples, other data may be stored in association with the image data depicting the clothing item. For example, identifying data, such as a name of an article of clothing, a designer, a description, etc. may be stored in association with an image of an article of clothing.

In some examples, image data depicting clothing items may depict an article of clothing owned or otherwise currently possessed by a user of the outfit recommendation system described herein. Accordingly, in such examples, the image data may be stored locally on a device owned by the user and/or remotely in a memory made available through the user's interaction with one or more cloud services. In some other examples, image data depicting clothing items may depict an article of clothing available through a store and/or e-commerce website. An outfit recommendation system as described herein may access one or more repositories of image data to recommend clothing items to a user that are determined to visually compliment one or more clothing items selected by the user as an initial clothing item or items of an outfit.

FIG. 1 depicts a system 100 effective to perform outfit recommendation using a recurrent neural network 122, in accordance with various embodiments of the present disclosure. In various examples, system 100 may comprise an electronic device including one or more processing elements 102 and a memory 103. In some further examples, system 100 may comprise a camera 101. In other examples, system 100 may be configured in communication with a camera 101 over a network 104. Similarly, system 100 may be configured in communication with remote computing device(s) 180 and/or mobile device(s) 182 over network 104. In various examples, mobile device 182 may be associated with a user 184. In some further examples, mobile device 182 may execute a companion application of system 100. In at least some examples, the companion application may interface with, control operation of, and/or perform some or all of the functionality described below in reference to system 100.

Camera 101 may include, for example, a digital camera module. The digital camera module may comprise any suitable type of image sensor device or devices, such as a charge coupled device (CCD) and/or a complementary metal-oxide semiconductor (CMOS) sensor effective to capture image data of clothing articles and/or other objects. In various examples, camera 101 and/or system 100 may be effective to segment portions of image data representing clothing items from other portions of the image data in order to separate the clothing item image data from background image data, hanger image data, and/or user image data. Image data representing articles of clothing may be stored in a repository of clothing items, as described in further detail below.

Network 104 may be, for example, the internet, an intranet, a wide area network, a local area network, or the like. In some examples, system 100 may be effective to send and receive data over network 104. The one or more processing elements 102 of system 100 may be effective to execute one or more instructions stored in memory 103 to cause the one or more processing elements 102 to execute various methods as described in further detail below.

System 100 comprises a repository 120 of image data. Repository 120 may be represented as a repository R={(I_(j),c_(j))}_(j=1) ^(N) of N image-category pairs. The repository 120 may include image-category pairs included an image 112 and an associated category label for the image 110. The j-th item in the repository is associated with image and label c₁∈{1, 2, . . . , K} (labels are sometimes referred to herein as “categories”), where K is the number of different clothing article/accessory categories. Each image 112 (e.g., image I_(j)) of repository 120 is associated with a label for the image (e.g., category label c_(j)). In various examples, repository 120 may be stored in memory 103 and/or may be stored in a memory associated with remote computing device(s) 180.

A user, such as user 184, may request one or more clothing items for a current outfit z at action 114. Users may also manually add and/or delete clothing items from a current outfit z to generate an outfit z′ and may request updated recommendations for the outfit z′. Requesting recommendation of one or more clothing items may comprise specification of current clothing items of the outfit z along with a selection of a next category c_(z) _(t+1) . Current clothing items of the outfit z may be represented by feature vectors (sometimes referred to herein as “visual feature vectors”). For a given clothing item of the current outfit z, the corresponding feature vector may be determined by a visual feature extractor function sometimes denoted herein by the function ƒ. The visual feature extractor function ƒ may receive input image data and output a feature vector of length M that is representative of the input image data. In other words, the visual feature extractor function ƒ may be effective to generate vector representations of input image data. In various examples, feature vectors for clothing items stored in repository 120 may be stored in memory 103 in association with the image data used to generate the feature vector. In various examples, the function ƒ may be learned or may be a static function. In various examples, the visual feature extractor function ƒ may be a layer output of a pre-trained network. For example, layer FC6 or another fully connected layer or convolutional layer of AlexNet may be used. In some other examples, a Siamese neural network architecture and/or a triplet-based approach may be used.

Recurrent neural network 122 may receive input feature vectors representing clothing items and/or accessories currently selected for an outfit z along with an indication of a next category c_(z) _(t+1) for which a recommendation is to be generated. Recurrent neural network 122 is described in additional detail below in the description of FIGS. 2A, 2B. Recurrent neural network 122 may generate a feature vector 130 for each category c for which a recommendation is requested. Visual search component 132 takes in feature vector 130 of length M and finds the image data in repository 120 closest to feature vector 130 by computing the distance between the feature vector 130 and {ƒ(I₁), . . . , ƒ(I_(N))} (e.g., the set of feature vectors associated with the image data stored in repository 120). The distance between the vectors may be determined in any suitable manner. For example, the Euclidean distance between the vectors may be determined. When a recommendation is requested for a particular category of clothing, visual search component 132 may conduct a search over only those feature vectors that correspond to the requested category c. At action 140, system 100 outputs the image result(s) of the image data I stored in repository 120 with feature vectors that most closely match feature vector 130. In various examples, the top 10, 15, 20, etc. image results may be transmitted for display to the user on the user's computer display (not shown in FIG. 1).

FIG. 2A depicts an example of the recurrent neural network 122 of FIG. 1 that may be used to perform outfit recognition in various embodiments. Those components in FIG. 2A that have been described above in reference to FIG. 1 may not be described again below, for purposes of clarity and brevity. In FIG. 2A, a long short-term memory (LSTM) neural network 200 is able to store values (e.g., state information regarding previously-selected clothing items in an outfit) over variable intervals (e.g., during the recommendation of a variable number of new clothing items for the outfit). In other applications, LSTMs are used in text-based problems to predict sequences of words (e.g., the LSTMs model how to advance from word to word in one or more sentences based on previous words in the one or more sentences). Accordingly, the outfits z may comprise an ordered list of articles of clothing (e.g., {shirt, pants, shoes, bags, jewelry}). However, during training of the LSTM 200, the order may be repeatedly randomized in order to approximate an order-invariant process.

During training a set of outfits Z is provided. Outfit z E Z is a vector of integers having |z| clothing items, where the j-th element, z^(j), is an index into repository 120 (R={(I_(j),c_(j))}_(j=1) ^(N)). Although z is ordered, as previously mentioned, the order is repeatedly scrambled (e.g., randomized) to approximate an order-invariant process. Training may be used to produce a recurrent neural network 122 (e.g., the LSTM 200 depicted in FIG. 2A and the LSTM 240 depicted in FIG. 2B) that: for an outfit z, given items (I_(z) ₁ ,c_(z) ₁ ), . . . , (I_(z) _(t) ,c_(z) _(t) ), produces a visual feature vector for category c_(z) _(t+1) , denoted x^(t+1), so that ƒ(I_(z) _(t+i) )≈x^(t+1). After training, inputting x^(t+1) into visual search component 132 of FIG. 1 may result in a top retrieval result for I_(z) _(t+1) from repository 120.

In FIG. 2A, the input into each cell of the LSTM 200 is a state vector 210 (including, for example, state vectors 210 a, 210 b, 210 c, 210 d, etc.) and an input vector 204 of size M+K (including, for example, input vectors 204 a, 204 b, 204 c, etc.). Input vector 204 may sometimes be referred to herein as a “combined input vector”. The input vector 204 may be a concatenation of a visual descriptor feature vector (e.g., ƒ(I_(z) ₁ ), etc.) and a one-hot encoded category vector 61 (e.g., in place of the category label c). Each cell yields an updated state vector and an output feature vector 130 of size M Although, three cells 212 a, 212 b, and 212 c are depicted in FIG. 2A for exemplary purposes, any number of cells may be used in accordance with the various techniques described herein.

Initial state 210 a may be the zero vector. The input to each cell of the LSTM is a visual descriptor feature vector (e.g., ƒ(I_(z) ₁ ), etc.) for a selected item of an outfit and the next item's category (e.g., the clothing category for a recommendation is to be generated—e.g., hats, scarves, shoes, etc.). The output of each cell is an output feature vector that may be used as an input to visual search component 132 of FIG. 1 in order to produce a set of one or more recommended articles of clothing from the requested category and an updated state vector. The updated state vector includes current known information regarding the selected clothing items comprising the outfit.

In the example depicted in FIG. 2A, cell 212 a may receive initial state 210 a (e.g., the zero vector) and may receive combined input vector 204 a comprising the visual descriptor feature vector ƒ(I_(z) ₁ ) concatenated with the one-hot encoded category vector {right arrow over (c)}_(z) _(i) ₂ . Cell 212 a may generate output feature vector 130 a (e.g., x_(i) ²). Output feature vector 130 a may be used by visual search component 132 to search repository 120 over the set of image data in repository 120 with feature vectors corresponding to category vector {right arrow over (c)}_(z) _(i) ₂ . Additionally, cell 212 a may generate updated state information 210 b. Updated state information 210 b may comprise data indicating a current state of the outfit z including the visual descriptor feature vector ƒ(I_(z) ₁ ) corresponding to a selected item of the outfit z.

Cell 212 b may receive updated state 210 b from cell 212 a. Additionally, cell 212 b may receive input vector 204 b comprising the visual descriptor feature vector ƒ(I_(z) ₂ ) concatenated with the one-hot encoded category vector {right arrow over (c)}_(z) ₃ . In the example, category vector {right arrow over (c)}_(z), may represent the next category of clothing items for which a recommendation is requested for the current outfit recommendation. In the example, I_(z) ₂ may represent an image selected by the user from among the results of the visual search of image data in repository 120 (e.g., in category {right arrow over (c)}_(z) _(i) ₂ ) using output feature vector 130 a (e.g., x_(i) ²) from cell 212 a. However, I_(z) ₂ need not be selected from repository 120. For example, I_(z) ₂ may represent newly uploaded image data depicting an article of clothing. Cell 212 b may generate output feature vector 130 b (e.g., x_(i) ³). Output feature vector 130 b may be used by visual search component 132 to search repository 120 over the set of image data in repository 120 with feature vectors corresponding to category vector {right arrow over (c)}_(z) _(i) ₃ . Additionally, cell 212 b may generate updated state information 210 c. Updated state information 210 c may comprise data indicating a current state of the outfit z including the visual descriptor feature vectors ƒ(I_(z) ₁ ) and ƒ(I_(z) ₂ ) corresponding to selected items of the outfit z.

Cell 212 c may receive updated state 210 c from cell 212 b. Additionally, cell 212 c may receive input vector 204 c comprising the visual descriptor feature vector ƒ(I_(z) ₃ ) concatenated with the one-hot encoded category vector {right arrow over (c)}_(z) ₄ . In the example, category vector {right arrow over (c)}_(z), may represent the next category of clothing items for which a recommendation is requested for the current outfit recommendation. In the example, I_(z) ₃ may represent an image selected by the user from among the results of the visual search of image data in repository 120 (e.g., in category {right arrow over (c)}_(z) _(i) ₃ ) using output feature vector 130 b (e.g., x_(i) ³) from cell 212 b. However, I_(z) ₃ need not be selected from repository 120. For example, I_(z) ₃ may represent image data depicting an article of clothing that is not stored in repository 120, but has been selected by the user. Cell 212 c may generate output feature vector 130 c (e.g., x_(i) ⁴). Output feature vector 130 c may be used by visual search component 132 to search repository 120 over the set of image data in repository 120 with feature vectors corresponding to category vector {right arrow over (c)}_(z) ₄ . Additionally, cell 212 c may generate updated state information 210 d. Updated state information 210 d may comprise data indicating a current state of the outfit z including the visual descriptor feature vectors ƒ(I_(z) ₁ ), ƒ(I_(z) ₁ ), and ƒ(I_(z) ₃ ) corresponding to selected items of the outfit z.

FIG. 2B depicts another example of recurrent neural network 122 of FIG. 1 that may be used to perform outfit recognition in various embodiments. Those components in FIG. 2B that have been described above in reference to FIGS. 1 and 2A may not be described again below, for purposes of clarity and brevity.

In the example recurrent neural network depicted in FIG. 2B, the input to each cell of the LSTM 240 is a state vector 250 (including, for example, state vectors 250 a, 250 b, 250 c, 250 d, etc.) and an input vector 242 of size M+K (including, for example, input vectors 242 a, 242 b, 242 c, etc.).

In the example depicted in FIG. 2B, the initial state 250 a may be the zero vector. The input to each cell of the LSTM may be a visual descriptor feature vector (e.g., ƒ(I_(z) ₁ ), etc.) and the one-hot encoded category vector {right arrow over (c)}¹ corresponding to the current visual descriptor feature vector. The updated state vector (e.g., updated state vectors 250 b, 250 c and 250 d) may include current known information regarding the selected clothing items comprising the outfit.

An output of each cell may be concatenated with the next item's category to generate a combined output feature vector and provided to a fully connected layer network (including fully connected layers 260 a, 260 b and/or 260 c). Fully connected layers 260 a, 260 b and/or 260 c may be multi-layer perceptron cells. Fully connected layers 260 a, 260 b and/or 260 c are provided by way of example only. In various other implementations, convolutional layers and/or other neural network components may be used instead.

In the example depicted in FIG. 2B, the output of fully connected layers 260 a, 260 b and 260 c may be the output feature vectors 130 a, 130 b and 130 c, respectively. As previously described, the output feature vectors 130 a, 130 b, and 130 c may be used by visual search component 132 of FIG. 1 to search repository 120 over the set of image data in repository 120 with feature vectors corresponding to the appropriate category vectors. Additionally, each cell 252 (including cells 252 a, 252 b, and 252 c) may generate updated state information (e.g., updated state information 250 b, 250 c, and 250 d). The updated state information may comprise data indicating a current state of the outfit z including the visual descriptor feature vectors ƒ(1,i), ƒ(I_(z) ₂ ), and ƒ(I_(z) ₃ ) corresponding to selected items of the outfit z.

In the example recurrent neural network depicted in FIG. 2B, the input into the LSTM is based on user selection rather than a user's request for a next category. Instead, the output of the LSTM is coupled with the requested category. The concatenated output of the LSTM and requested next clothing category are input into the fully connected network (e.g., fully connected layers 260 a, 260 b, and/or 260 c) to generate the output feature vectors 130 a, 130 b, and/or 130 c. As such, in the recurrent neural network depicted in FIG. 2B, the internal state is decoupled from user category requests.

FIG. 3 depicts a loss function that may be minimized during training of a recurrent neural network, in accordance with the outfit recommendation techniques described herein. Those components in FIG. 3 that have been previously described in reference to FIGS. 1 and 2 may not be described again herein for purposes of clarity and brevity.

Various loss functions may be used to characterize the outfit recommendation model and may be minimized on a particular training set. In various examples, a loss function may express the discrepancy between the predictions of the outfit recommendation model being trained and the actual repository instances. FIG. 3 depicts a triplet loss function that mimics retrieval at a batch level. The output visual descriptor feature vector (e.g., output feature vectors 130 a, 130 b, 130 c, etc.) is encouraged to be closer to the actual visual descriptor feature vector of the repository 120 (e.g., ƒ(I_(z) ₁ ), ƒ(I_(z) ₂ )) when compared with all other visual descriptor feature vectors belonging to the same category. The truncated retrieval is performed at the batch level. The equation depicted in FIG. 3 is minimized for a batch of B outfits, B={z₁, . . . , z_(B)} D is a distance function (e.g., Euclidean distance) that computes the distance (e.g., dissimilarity) between two pairs of vectors. The first vector is the output feature vector of the recurrent neural network (e.g., x_(i) ³ from the LSTM 240 depicted in FIG. 2B). The second vector represents targets (e.g., feature vectors) from the same class for the batch that are not of interest (for purposes of training). γ is a margin parameter used to “steer” the training process to form a buffer between the desired discrepancy and undesired discrepancies. For example, if the margin is 0.2, the loss function penalizes the mini-retrieval when D(x, non-target)<D(x, target)+0.2. [.]₊ is the positive part function. The first two summations traverse all image descriptors in all of the outfits from the second item onward. The next two summations extract all image descriptors in the batch that match the category of item z_(i) ^(j).

FIG. 4 is a block diagram showing an example architecture 400 of a computing device, such as the system 100 and/or remote computing device(s) 180, and/or other computing devices described herein. It will be appreciated that not all user devices will include all of the components of the architecture 400 and some user devices may include additional components not shown in the architecture 400. The architecture 400 may include one or more processing elements 404 for executing instructions and retrieving data stored in a storage element 402. The processing element 404 may comprise at least one processor. Any suitable processor or processors may be used. For example, the processing element 404 may comprise one or more digital signal processors (DSPs). In some examples, the processing element 404 may be effective to perform outfit recommendation techniques, as described above. The storage element 402 can include one or more different types of memory, data storage, or computer-readable storage media devoted to different purposes within the architecture 400. For example, the storage element 402 may comprise flash memory, random-access memory, disk-based storage, etc. Different portions of the storage element 402, for example, may be used for program instructions for execution by the processing element 404, storage of images or other digital works, and/or a removable storage for transferring data to other devices, etc.

The storage element 402 may also store software for execution by the processing element 404. An operating system 422 may provide the user with an interface for operating the user device and may facilitate communications and commands between applications executing on the architecture 400 and various hardware thereof. A transfer application 424 may be configured to send and/or receive image and/or video data to and/or from other devices (e.g., a mobile device, remote device, image capture device, and/or display device). In some examples, the transfer application 424 may also be configured to upload the received images to another device that may perform processing as described herein (e.g., a mobile device or another computing device).

In various examples, outfit recommendation engine 485 may be effective to implement a recurrent neural network for outfit recommendation as described above in reference to FIGS. 1-3. Additionally, in various examples, outfit recommendation engine 485 may be effective to implement visual search component 132 and may search repository 120 for image data with feature vectors that match a target feature vector. As previously described, a recurrent neural network 122 may determine one or more target feature vectors based on a current outfit and one or more selected clothing article categories for which to receive recommendations.

When implemented in some user devices, the architecture 400 may also comprise a display component 406. The display component 406 may comprise one or more light-emitting diodes (LEDs) or other suitable display lamps. Also, in some examples, the display component 406 may comprise, for example, one or more devices such as cathode ray tubes (CRTs), liquid-crystal display (LCD) screens, gas plasma-based flat panel displays, LCD projectors, raster projectors, infrared projectors or other types of display devices, etc.

The architecture 400 may also include one or more input devices 408 operable to receive inputs from a user. The input devices 408 can include, for example, a push button, touch pad, touch screen, wheel, joystick, keyboard, mouse, trackball, keypad, light gun, game controller, or any other such device or element whereby a user can provide inputs to the architecture 400. These input devices 408 may be incorporated into the architecture 400 or operably coupled to the architecture 400 via wired or wireless interface. In some examples, architecture 400 may include a microphone 470 for capturing sounds, such as voice commands. Voice recognition engine 480 may interpret audio signals of sound captured by microphone 470. In some examples, voice recognition engine 480 may listen for a “wake word” to be received by microphone 470. Upon receipt of the wake word, voice recognition engine 480 may stream audio to a voice recognition server for analysis. In various examples, voice recognition engine 480 may stream audio to external computing devices via communication interface 412.

When the display component 406 includes a touch-sensitive display, the input devices 408 can include a touch sensor that operates in conjunction with the display component 406 to permit users to interact with the image displayed by the display component 406 using touch inputs (e.g., with a finger or stylus). The architecture 400 may also include a power supply 414, such as a wired alternating current (AC) converter, a rechargeable battery operable to be recharged through conventional plug-in approaches, or through other approaches such as capacitive or inductive charging.

The communication interface 412 may comprise one or more wired or wireless components operable to communicate with one or more other user devices. For example, the communication interface 412 may comprise a wireless communication module 436 configured to communicate on a network, such as the network 104, according to any suitable wireless protocol, such as IEEE 802.11 or another suitable wireless local area network (WLAN) protocol. A short range interface 434 may be configured to communicate using one or more short range wireless protocols such as, for example, near field communications (NFC), Bluetooth, Bluetooth LE, etc. A mobile interface 440 may be configured to communicate utilizing a cellular or other mobile protocol. A Global Positioning System (GPS) interface 438 may be in communication with one or more earth-orbiting satellites or other suitable position-determining systems to identify a position of the architecture 400. A wired communication module 442 may be configured to communicate according to the USB protocol or any other suitable protocol.

The architecture 400 may also include one or more sensors 430 such as, for example, one or more position sensors, image sensors, and/or motion sensors (e.g., camera 101 depicted in FIG. 1). An image sensor 432 is shown in FIG. 4. Some examples of the architecture 400 may include multiple image sensors 432. For example, a panoramic camera system may comprise multiple image sensors 432 resulting in multiple images and/or video frames that may be stitched and may be blended to form a seamless panoramic output.

Motion sensors may include any sensors that sense motion of the architecture including, for example, gyro sensors 444 and accelerometers 446. Motion sensors, in some examples, may be used to determine an orientation, such as a pitch angle and/or a roll angle of a camera. The gyro sensor 444 may be configured to generate a signal indicating rotational motion and/or changes in orientation of the architecture (e.g., a magnitude and/or direction of the motion or change in orientation). Any suitable gyro sensor may be used including, for example, ring laser gyros, fiber-optic gyros, fluid gyros, vibration gyros, etc. The accelerometer 446 may generate a signal indicating an acceleration (e.g., a magnitude and/or direction of acceleration). Any suitable accelerometer may be used including, for example, a piezoresistive accelerometer, a capacitive accelerometer, etc. In some examples, the GPS interface 438 may be utilized as a motion sensor. For example, changes in the position of the architecture 400, as determined by the GPS interface 438, may indicate the motion of the GPS interface 438.

In some examples, architecture 400 may include a depth sensor 448. Depth sensor 448 may be effective to determine a distance between image sensor 432 and a surface detected by depth sensor 448. In some examples, the depth sensor 448 may determine the contours of the surface and may be capable of using computer vision techniques to recognize facial patterns or other markers within the field of view of the depth sensor 448's infrared sensor. In some examples, the depth sensor 448 may include an infrared projector and camera. Processing element 404 may build a depth map based on detection by the infrared camera of a pattern of structured light displayed on a surface by the infrared projector. In some other examples, the depth sensor 448 may include a time of flight camera that may compute distance based on the speed of light by measuring the time of flight of a light signal between a camera of the depth sensor 448 and a surface of an environment. In some examples, processing element 404 may be effective to determine the location of various objects in the physical environment within the field of view of image sensor 432 based on the depth map created by the depth sensor 448. In some examples, non-infrared depth sensors, such as passive stereo camera pairs, or non-identical camera pairs, may be used in place of, or in addition to, infrared light sources of depth sensor 448.

FIG. 5 is a flowchart 500 illustrating a first example process for performing recurrent neural network outfit recommendation that may be used in accordance with the present disclosure. In some examples, the process of FIG. 5 may be performed by a user computing device, such as a mobile device. In some other examples, the process of FIG. 5 may be performed by one or more remote computing devices (e.g., remote computing device(s) 180). In some examples where the process of FIG. 5 is performed by one or more remote computing devices, a companion application on a mobile device and/or a web-based application may be used to control and/or interface with the outfit recommendation process performed by the remote computing device(s). In various examples, users may submit image data representing one or more articles of clothing owned, possessed, favorited, liked, or otherwise associated with a user to the remote computing device(s). In some examples, the remote computing device(s) may add such image data to repository 120. In some examples, repository 120 may comprise a user-account specific repository specific to image data of a particular user account. Accordingly, a user may upload their personal wardrobe as a portion of the repository 120 associated with the user's account. Additionally, the repository 120 may interface with one or more online databases to store image data of clothing available through one or more online resources (e.g., through an e-commerce site).

The process of FIG. 5 may begin at action 510, “Receive a first state vector, the state vector comprising an indication of a first article of clothing.” At action 510, a computing device (e.g., a computing device executing a recurrent neural network such as the LSTM 200 depicted in FIG. 2A) may receive a first state vector. If no previous items have been selected for a particular outfit, the first state vector may be the zero vector. In various other examples, if one or more articles of clothing have been selected for a particular outfit, the state vector may comprise an indication of the previously-selected articles of clothing.

The process of FIG. 5 may continue from action 510 to action 520, “Receive first image data depicting a second article of clothing different from the first article of clothing.” At action 520, the computing device (e.g., system 100 and/or remote computing device(s) 180) may receive first image data depicting a second article of clothing. The second article of clothing may be an article of clothing selected by a user for the current outfit. In various examples, the user may select the second article of clothing based on a previous recommendation of the recurrent neural network or based on manual selection. The first image data may be stored in a repository of clothing item image data (e.g., repository 120 depicted in FIG. 1). The first image data may be input to a visual feature extractor function ƒ that may output a visual feature vector representing the first image data.

The process of FIG. 5 may continue from action 520 to action 530, “Receive an indication of a next clothing category.” At action 530, the computing device may receive an indication of a next clothing category for which a recommendation is to be provided. In various examples, the indication of the next clothing category may comprise a vector of length K as described above. In various examples, the next clothing category vector may be concatenated with the visual feature vector representing the first image data.

The process of FIG. 5 may continue from action 530 to action 540, “Generate, by a recurrent neural network, a first output feature vector based on the first state vector, the first image data and the next clothing category.” At action 540, a combined input vector comprising the next clothing category vector and the visual feature vector representing the first image data may be input into a cell of a recurrent neural network (e.g., the LSTM 200). Additionally, the first state vector may be input into the cell of the recurrent neural network. The cell of the recurrent neural network may be effective to generate a first output feature vector based on the various inputs to the cell.

The process of FIG. 5 may continue from action 540 to action 550, “Determine distances between the first output feature vector and other feature vectors of the next clothing category.” At action 550, the computing device may be effective to determine distances between the first output feature vector and feature vectors of the next clothing category stored in a repository. In various examples, the repository (e.g., repository 120) may store image data. The image data may be input to the visual feature extractor function ƒ to generate respective visual descriptor feature vectors for the image data stored in the repository. The visual descriptor feature vectors may be compared with the first output feature vector to determine respective distances (e.g., Euclidean distances) between the first output feature vector and the visual descriptor feature vectors.

The process of FIG. 5 may continue from action 550 to action 560, “Generate a ranked list of recommendations based on the distances.” At action 560, the computing device may generate a ranked list of clothing item recommendations of clothing items in the first clothing category. In various examples, the ranked list may comprise images displayed to the user of items recommended by system 100. The ranked list may comprise images from a particular category c requested by the user. The list of clothing items may be ranked in ascending order of distances (e.g., Euclidean distances) between the visual descriptor feature vectors of the clothing items and the first output feature vector. In other words, the clothing item with the smallest distance between the visual descriptor feature vector for the clothing item and the first output feature vector may be the top-ranked item. In various examples, the ranked list may be limited to a predefined number of recommendations (e.g., the top 50 results) to present an easily digestible number of recommendations.

FIG. 6 is a flowchart 600 illustrating an example process for performing recurrent neural network outfit recommendation that may be used in accordance with the present disclosure. In some examples, the process of FIG. 6 may be performed by a user computing device, such as a mobile device. In some other examples, the process of FIG. 6 may be performed by one or more remote computing devices (e.g., remote computing device(s) 180). In some examples where the process of FIG. 6 is performed by one or more remote computing devices, a companion application on a mobile device and/or a web-based application may be used to control and/or interface with the outfit recommendation process performed by the remote computing device(s). In various examples, users may submit image data representing one or more articles of clothing owned, possessed, favorited, liked, or otherwise associated with a user to the remote computing device(s). In some examples, the remote computing device(s) may add such image data to repository 120. In some examples, repository 120 may comprise a user-account specific repository specific to image data of a particular user account. Accordingly, a user may upload their personal wardrobe as a portion of the repository 120 associated with the user's account. Additionally, the repository 120 may interface with one or more online databases to store image data of clothing available through one or more online resources (e.g., through an e-commerce site).

The process of FIG. 6 may begin at action 610, “Receive a state vector, the state vector comprising an indication of an article of clothing.” At action 610, a computing device (e.g., a computing device executing a recurrent neural network such as the LSTM 200 depicted in FIG. 2A) may receive a state vector. If no previous items have been selected for a particular outfit, the initial state vector may be the zero vector. In various other examples, if one or more articles of clothing have been selected for a particular outfit, the state vector may comprise an indication of the previously-selected articles of clothing.

The process of FIG. 6 may continue from action 610 to action 620, “Receive image data depicting a selected article of clothing.” At action 620, the computing device (e.g., system 100 and/or remote computing device(s) 180) may receive image data depicting a selected article of clothing. The selected article of clothing may be an article of clothing selected by a user for the current outfit. In various examples, the user may select the article of clothing based on a previous recommendation of the recurrent neural network or based on manual selection. The image data of the selected clothing item may be stored in a repository of clothing item image data (e.g., repository 120 depicted in FIG. 1). The image data of the selected clothing item may be input to a visual feature extractor function ƒ that may output a visual feature vector representing the selected image data.

The process of FIG. 6 may continue from action 620 to action 630, “Receive an indication of a next clothing category.” At action 630, the computing device may receive an indication of a next clothing category for which a recommendation is to be provided. In various examples, the indication of the next clothing category may comprise a vector of length K as described above. In various examples, the next clothing category vector may be concatenated with the visual feature vector representing the first image data.

The process of FIG. 6 may continue from action 630 to action 640, “Generate, by a recurrent neural network, an output feature vector based on the state vector, the image data and the next clothing category.” At action 640, a combined input vector comprising the next clothing category vector and the visual feature vector representing the selected image data may be input into a cell of a recurrent neural network (e.g., the LSTM 200). Additionally, the state vector may be input into the cell of the recurrent neural network. The cell of the recurrent neural network may be effective to generate an output feature vector based on the various inputs to the cell.

The process of FIG. 6 may continue from action 640 to action 650, “Determine distances between the output feature vector and other feature vectors of the next clothing category and generate ranked list.” At action 650, the computing device may be effective to determine distances between the output feature vector and feature vectors of the next clothing category stored in a repository. In various examples, the repository (e.g., repository 120) may store image data. The image data may be input to the visual feature extractor function ƒ to generate respective visual descriptor feature vectors for the image data stored in the repository. The visual descriptor feature vectors may be compared with the first output feature vector to determine respective distances (e.g., Euclidean distances) between the first output feature vector and the visual descriptor feature vectors. The computing device may generate a ranked list of clothing item recommendations of clothing items in the next clothing category. The list of clothing items may be ranked in ascending order of distances between the visual descriptor feature vectors of the clothing items and the output feature vector. In other words, the clothing item with the smallest distance between the visual descriptor feature vector for the clothing item and the first output feature vector may be the top-ranked item. In various examples, the ranked list may be limited to a predefined number of recommendations (e.g., the top 50 results) to present a number of recommendations that is easily digestible by a user.

The process of FIG. 6 may continue from action 650 to optional action 660, “Receive selection”. At optional action 660, a user may select a clothing item to be added to the outfit. In various examples, the clothing item may be selected from the ranked list generated at action 650. In various examples, images of the clothing items in the ranked list may be displayed on a display and may allow a user to select an image of an item to be added to the current outfit.

The process of FIG. 6 may continue from action 660 to action 670 at which a determination may be made whether or not the user desires additional recommendations. If not, the process of FIG. 6 may end. If further recommendations are desired the process of FIG. 6 may continue from action 670 to action 680, “Update state vector”. At action 680, the state vector may be updated to reflect the various items selected by the user, including any new clothing items selected at action 660 and/or any clothing items that have been otherwise added or deleted from the current outfit. Processing may continue from action 680 to action 610 whereupon the recurrent neural network may generate further recommendations for one or more other clothing categories.

An example system for sending and providing data will now be described in detail. In particular, FIG. 7 illustrates an example computing environment in which the embodiments described herein may be implemented. FIG. 7 is a diagram schematically illustrating an example of a data center 85 that can provide computing resources to users 70 a and 70 b (which may be referred herein singularly as user 70 or in the plural as users 70) via user computers or other network-connected devices 72 a and 72 b (which may be referred herein singularly as computer 72 or in the plural as computers 72) via network 104. In various examples, system 100 depicted in FIG. 1 may be an example of a computer or other network-connected device 72 a and/or 72 b. Data center 85 may be configured to provide computing resources for executing applications on a permanent or an as-needed basis. The computing resources provided by data center 85 may include various types of resources, such as gateway resources, load balancing resources, routing resources, networking resources, computing resources, volatile and non-volatile memory resources, content delivery resources, data processing resources, data storage resources, data communication resources and the like. Each type of computing resource may be available in a number of specific configurations. For example, data processing resources may be available as virtual machine instances that may be configured to provide various web services. In addition, combinations of resources may be made available via a network and may be configured as one or more web services. The instances may be configured to execute applications, including web services, such as application services, media services, database services, processing services, gateway services, storage services, routing services, security services, encryption services, load balancing services, application services and the like.

These services may be configurable with set or custom applications and may be configurable in size, execution, cost, latency, type, duration, accessibility and in any other dimension. These web services may be configured as available infrastructure for one or more clients and can include one or more applications configured as a platform or as software for one or more clients. These web services may be made available via one or more communications protocols. These communications protocols may include, for example, hypertext transfer protocol (HTTP) or non-HTTP protocols. These communications protocols may also include, for example, more reliable transport layer protocols, such as transmission control protocol (TCP), and less reliable transport layer protocols, such as user datagram protocol (UDP). Data storage resources may include file storage devices, block storage devices and the like.

Each type or configuration of computing resource may be available in different sizes, such as large resources—consisting of many processors, large amounts of memory and/or large storage capacity—and small resources—consisting of fewer processors, smaller amounts of memory and/or smaller storage capacity. Customers may choose to allocate a number of small processing resources as web servers and/or one large processing resource as a database server, for example.

Data center 85 may include servers 76 a and 76 b (which may be referred herein singularly as server 76 or in the plural as servers 76) that provide computing resources. These resources may be available as bare metal resources or as virtual machine instances 78 a-d (which may be referred herein singularly as virtual machine instance 78 or in the plural as virtual machine instances 78).

The availability of virtualization technologies for computing hardware has afforded benefits for providing large scale computing resources for customers and allowing computing resources to be efficiently and securely shared between multiple customers. For example, virtualization technologies may allow a physical computing device to be shared among multiple users by providing each user with one or more virtual machine instances hosted by the physical computing device. A virtual machine instance may be a software emulation of a particular physical computing system that acts as a distinct logical computing system. Such a virtual machine instance provides isolation among multiple operating systems sharing a given physical computing resource. Furthermore, some virtualization technologies may provide virtual resources that span one or more physical resources, such as a single virtual machine instance with multiple virtual processors that span multiple distinct physical computing systems.

Referring to FIG. 7, network 104 may, for example, be a publicly accessible network of linked networks and possibly operated by various distinct parties, such as the Internet. In other embodiments, network 104 may be a private network, such as a corporate or university network that is wholly or partially inaccessible to non-privileged users. In still other embodiments, network 104 may include one or more private networks with access to and/or from the Internet.

Network 104 may provide access to computers 72. User computers 72 may be computers utilized by users 70 or other customers of data center 85. For instance, user computer 72 a or 72 b may be a server, a desktop or laptop personal computer, a tablet computer, a wireless telephone, a personal digital assistant (PDA), an e-book reader, a game console, a set-top box or any other computing device capable of accessing data center 85. User computer 72 a or 72 b may connect directly to the Internet (e.g., via a cable modem or a Digital Subscriber Line (DSL)). Although only two user computers 72 a and 72 b are depicted, it should be appreciated that there may be multiple user computers.

User computers 72 may also be utilized to configure aspects of the computing resources provided by data center 85. In this regard, data center 85 might provide a gateway or web interface through which aspects of its operation may be configured through the use of a web browser application program executing on user computer 72. Alternately, a stand-alone application program executing on user computer 72 might access an application programming interface (API) exposed by data center 85 for performing the configuration operations. Other mechanisms for configuring the operation of various web services available at data center 85 might also be utilized.

Servers 76 shown in FIG. 7 may be servers configured appropriately for providing the computing resources described above and may provide computing resources for executing one or more web services and/or applications. In one embodiment, the computing resources may be virtual machine instances 78. In the example of virtual machine instances, each of the servers 76 may be configured to execute an instance manager 80 a or 80 b (which may be referred herein singularly as instance manager 80 or in the plural as instance managers 80) capable of executing the virtual machine instances 78. The instance managers 80 may be a virtual machine monitor (VMM) or another type of program configured to enable the execution of virtual machine instances 78 on server 76, for example. As discussed above, each of the virtual machine instances 78 may be configured to execute all or a portion of an application.

It should be appreciated that although the embodiments disclosed above discuss the context of virtual machine instances, other types of implementations can be utilized with the concepts and technologies disclosed herein. For example, the embodiments disclosed herein might also be utilized with computing systems that do not utilize virtual machine instances.

In the example data center 85 shown in FIG. 7, a router 71 may be utilized to interconnect the servers 76 a and 76 b. Router 71 may also be connected to gateway 74, which is connected to network 104. Router 71 may be connected to one or more load balancers, and alone or in combination may manage communications within networks in data center 85, for example, by forwarding packets or other data communications as appropriate based on characteristics of such communications (e.g., header information including source and/or destination addresses, protocol identifiers, size, processing requirements, etc.) and/or the characteristics of the private network (e.g., routes based on network topology, etc.). It will be appreciated that, for the sake of simplicity, various aspects of the computing systems and other devices of this example are illustrated without showing certain conventional details. Additional computing systems and other devices may be interconnected in other embodiments and may be interconnected in different ways.

In the example data center 85 shown in FIG. 7, a server manager 75 is also employed to at least in part direct various communications to, from and/or between servers 76 a and 76 b. While FIG. 7 depicts router 71 positioned between gateway 74 and server manager 75, this is merely an exemplary configuration. In some cases, for example, server manager 75 may be positioned between gateway 74 and router 71. Server manager 75 may, in some cases, examine portions of incoming communications from user computers 72 to determine one or more appropriate servers 76 to receive and/or process the incoming communications. Server manager 75 may determine appropriate servers to receive and/or process the incoming communications based on factors such as an identity, location or other attributes associated with user computers 72, a nature of a task with which the communications are associated, a priority of a task with which the communications are associated, a duration of a task with which the communications are associated, a size and/or estimated resource usage of a task with which the communications are associated and many other factors. Server manager 75 may, for example, collect or otherwise have access to state information and other information associated with various tasks in order to, for example, assist in managing communications and other operations associated with such tasks.

It should be appreciated that the network topology illustrated in FIG. 7 has been greatly simplified and that many more networks and networking devices may be utilized to interconnect the various computing systems disclosed herein. These network topologies and devices should be apparent to those skilled in the art.

It should also be appreciated that data center 85 described in FIG. 7 is merely illustrative and that other implementations might be utilized. It should also be appreciated that a server, gateway or other computing device may comprise any combination of hardware or software that can interact and perform the described types of functionality, including without limitation: desktop or other computers, database servers, network storage devices and other network devices, PDAs, tablets, cellphones, wireless phones, pagers, electronic organizers, Internet appliances, television-based systems (e.g., using set top boxes and/or personal/digital video recorders) and various other consumer products that include appropriate communication capabilities.

A network set up by an entity, such as a company or a public sector organization, to provide one or more web services (such as various types of cloud-based computing or storage) accessible via the Internet and/or other networks to a distributed set of clients may be termed a provider network. Such a provider network may include numerous data centers hosting various resource pools, such as collections of physical and/or virtualized computer servers, storage devices, networking equipment and the like, needed to implement and distribute the infrastructure and web services offered by the provider network. The resources may in some embodiments be offered to clients in various units related to the web service, such as an amount of storage capacity for storage, processing capability for processing, as instances, as sets of related services and the like. A virtual computing instance may, for example, comprise one or more servers with a specified computational capacity (which may be specified by indicating the type and number of CPUs, the main memory size and so on) and a specified software stack (e.g., a particular version of an operating system, which may in turn run on top of a hypervisor).

A number of different types of computing devices may be used singly or in combination to implement the resources of the provider network in different embodiments, for example computer servers, storage devices, network devices and the like. In some embodiments a client or user may be provided direct access to a resource instance, e.g., by giving a user an administrator login and password. In other embodiments the provider network operator may allow clients to specify execution requirements for specified client applications and schedule execution of the applications on behalf of the client on execution platforms (such as application server instances, Java™ virtual machines (JVMs), general-purpose or special-purpose operating systems, platforms that support various interpreted or compiled programming languages such as Ruby, Perl, Python, C, C++ and the like or high-performance computing platforms) suitable for the applications, without, for example, requiring the client to access an instance or an execution platform directly. A given execution platform may utilize one or more resource instances in some implementations; in other implementations, multiple execution platforms may be mapped to a single resource instance.

In many environments, operators of provider networks that implement different types of virtualized computing, storage and/or other network-accessible functionality may allow customers to reserve or purchase access to resources in various resource acquisition modes. The computing resource provider may provide facilities for customers to select and launch the desired computing resources, deploy application components to the computing resources and maintain an application executing in the environment. In addition, the computing resource provider may provide further facilities for the customer to quickly and easily scale up or scale down the numbers and types of resources allocated to the application, either manually or through automatic scaling, as demand for or capacity requirements of the application change. The computing resources provided by the computing resource provider may be made available in discrete units, which may be referred to as instances. An instance may represent a physical server hardware platform, a virtual machine instance executing on a server or some combination of the two. Various types and configurations of instances may be made available, including different sizes of resources executing different operating systems (OS) and/or hypervisors, and with various installed software applications, runtimes and the like. Instances may further be available in specific availability zones, representing a logical region, a fault tolerant region, a data center or other geographic location of the underlying computing hardware, for example. Instances may be copied within an availability zone or across availability zones to improve the redundancy of the instance, and instances may be migrated within a particular availability zone or across availability zones. As one example, the latency for client communications with a particular server in an availability zone may be less than the latency for client communications with a different server. As such, an instance may be migrated from the higher latency server to the lower latency server to improve the overall client experience.

In some embodiments the provider network may be organized into a plurality of geographical regions, and each region may include one or more availability zones. An availability zone (which may also be referred to as an availability container) in turn may comprise one or more distinct locations or data centers, configured in such a way that the resources in a given availability zone may be isolated or insulated from failures in other availability zones. That is, a failure in one availability zone may not be expected to result in a failure in any other availability zone. Thus, the availability profile of a resource instance is intended to be independent of the availability profile of a resource instance in a different availability zone. Clients may be able to protect their applications from failures at a single location by launching multiple application instances in respective availability zones. At the same time, in some implementations inexpensive and low latency network connectivity may be provided between resource instances that reside within the same geographical region (and network transmissions between resources of the same availability zone may be even faster).

As set forth above, content may be provided by a content provider to one or more clients. The term content, as used herein, refers to any presentable information, and the term content item, as used herein, refers to any collection of any such presentable information. A content provider may, for example, provide one or more content providing services for providing content to clients. The content providing services may reside on one or more servers. The content providing services may be scalable to meet the demands of one or more customers and may increase or decrease in capability based on the number and type of incoming client requests. Portions of content providing services may also be migrated to be placed in positions of lower latency with requesting clients. For example, the content provider may determine an “edge” of a system or network associated with content providing services that is physically and/or logically closest to a particular client. The content provider may then, for example, “spin-up,” migrate resources or otherwise employ components associated with the determined edge for interacting with the particular client. Such an edge determination process may, in some cases, provide an efficient technique for identifying and employing components that are well suited to interact with a particular client, and may, in some embodiments, reduce the latency for communications between a content provider and one or more clients.

In addition, certain methods or process blocks may be omitted in some implementations. The methods and processes described herein are also not limited to any particular sequence, and the blocks or states relating thereto can be performed in other sequences that are appropriate. For example, described blocks or states may be performed in an order other than that specifically disclosed, or multiple blocks or states may be combined in a single block or state. The example blocks or states may be performed in serial, in parallel or in some other manner. Blocks or states may be added to or removed from the disclosed example embodiments.

It will also be appreciated that various items are illustrated as being stored in memory or on storage while being used, and that these items or portions thereof may be transferred between memory and other storage devices for purposes of memory management and data integrity. Alternatively, in other embodiments some or all of the software modules and/or systems may execute in memory on another device and communicate with the illustrated computing systems via inter-computer communication. Furthermore, in some embodiments, some or all of the systems and/or modules may be implemented or provided in other ways, such as at least partially in firmware and/or hardware, including, but not limited to, one or more application-specific integrated circuits (ASICs), standard integrated circuits, controllers (e.g., by executing appropriate instructions, and including microcontrollers and/or embedded controllers), field-programmable gate arrays (FPGAs), complex programmable logic devices (CPLDs), etc. Some or all of the modules, systems and data structures may also be stored (e.g., as software instructions or structured data) on a computer-readable medium, such as a hard disk, a memory, a network or a portable media article to be read by an appropriate drive or via an appropriate connection. The systems, modules and data structures may also be sent as generated data signals (e.g., as part of a carrier wave or other analog or digital propagated signal) on a variety of computer-readable transmission media, including wireless-based and wired/cable-based media, and may take a variety of forms (e.g., as part of a single or multiplexed analog signal, or as multiple discrete digital packets or frames). Such computer program products may also take other forms in other embodiments. Accordingly, the present invention may be practiced with other computer system configurations.

Although the flowcharts and methods described herein may describe a specific order of execution, it is understood that the order of execution may differ from that which is described. For example, the order of execution of two or more blocks or steps may be scrambled relative to the order described. Also, two or more blocks or steps may be executed concurrently or with partial concurrence. Further, in some embodiments, one or more of the blocks or steps may be skipped or omitted. It is understood that all such variations are within the scope of the present disclosure.

It should be emphasized that the above-described embodiments of the present disclosure are merely possible examples of implementations set forth for a clear understanding of the principles of the disclosure. Many variations and modifications may be made to the above-described embodiment(s) without departing substantially from the spirit and principles of the disclosure. The various features and processes described above may be used independently of one another, or may be combined in various ways. All possible combinations and subcombinations are intended to fall within the scope of this disclosure.

In addition, conditional language, such as, among others, “can,” “could,” “might,” or “may,” unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain embodiments include, while other embodiments do not include, certain features, elements and/or steps.

Although this disclosure has been described in terms of certain example embodiments and applications, other embodiments and applications that are apparent to those of ordinary skill in the art, including embodiments and applications that do not provide all of the benefits described herein, are also within the scope of this disclosure. The scope of the inventions is defined only by the claims, which are intended to be construed without reference to any definitions that may be explicitly or implicitly included in any incorporated-by-reference materials. 

What is claimed is:
 1. A method, comprising: determining, by a computing device, a first state vector, the first state vector representing an outfit comprising at least a first article of clothing; receiving, by the computing device, first image data depicting a second article of clothing different from the first article of clothing; receiving, by the computing device, data representing a first clothing category; generating, by the computing device, a first output feature vector based on the first state vector, the first image data, and the data representing the first clothing category; determining, by the computing device, a first visual feature vector of second image data representing a third article of clothing, wherein the third article of clothing is associated with the first clothing category; determining, by the computing device, a second visual feature vector of third image data representing a fourth article of clothing, wherein the fourth article of clothing is associated with the first clothing category; determining, by the computing device, a first distance between the first visual feature vector and the first output feature vector; determining, by the computing device, a second distance between the second visual feature vector and the first output feature vector, the second distance being greater than the first distance; generating a second state vector based on the first state vector and the second image data; receiving, by the computing device, data representing a second clothing category; determining, by the computing device, a third visual feature vector of fourth image data representing a fifth article of clothing based at least in part on the first state vector and the second state vector, wherein the fifth article of clothing is associated with the second clothing category; and outputting, by the computing device, the fourth image data.
 2. The method of claim 1, wherein generating the first output feature vector comprises using a long short-term memory (LSTM) network of the computing device to generate the first output feature vector, the method further comprising: generating, by the LSTM network of the computing device, the second state vector, wherein the second state vector represents the outfit comprising at least the first article of clothing and the second article of clothing.
 3. The method of claim 1, wherein the first clothing category comprises a next clothing category requested for recommendation by the computing device.
 4. The method of claim 1, wherein the second article of clothing is of the first clothing category and wherein the data representing the first clothing category comprises a category vector representing the first clothing category.
 5. The method of claim 4, further comprising: concatenating the first output feature vector with a second category vector to generate a combined output feature vector, wherein the second category vector represents a next clothing category requested for recommendation by the computing device; providing the combined output feature vector to a fully connected layer network; generating, by the fully connected layer network a second output feature vector; determining, by the computing device, a first plurality of feature vectors of the next clothing category, wherein each of the first plurality of feature vectors represents a respective image of a clothing item of the next clothing category; determining, by the computing device, respective distances between the second output feature vector and each of the first plurality of feature vectors; and generating a ranked list of clothing items in ascending order of the respective distances.
 6. The method of claim 1, further comprising: providing the first image data to a visual feature extractor function; and generating, by the visual feature extractor function, an input feature vector representing the first image data, wherein the first output feature vector is generated further based on the input feature vector.
 7. The method of claim 6, further comprising: concatenating the input feature vector and a category vector representing the first clothing category to generate a concatenated input vector; and providing the concatenated input vector to a recurrent neural network, wherein the first output feature vector is generated based on the concatenated input vector and the first state vector.
 8. The method of claim 1, further comprising: determining respective Euclidean distances between the first output feature vector and each of a plurality of other visual feature vectors, wherein each visual vector of the plurality of other visual feature vectors represents an image of a different article of clothing of the first clothing category; and generating, by the computing device, a ranked list of images of articles of clothing of the first clothing category in ascending order of the respective Euclidean distances.
 9. The method of claim 1, wherein generating the first output feature vector comprises using an order invariant long short-term memory (LSTM) network of the computing device to generate the first output feature vector.
 10. A computing device, comprising: at least one processor; and a memory configured to be in communication with the at least one processor, the memory effective to store instructions that, when executed by the at least one processor, cause the at least one processor to perform a method comprising: determining a first state vector, the first state vector representing an outfit comprising at least a first article of clothing; receiving first image data depicting a second article of clothing different from the first article of clothing; receiving data representing a first clothing category; generating a first output feature vector based on the first state vector, the first image data and the first clothing category; determining a first visual feature vector of second image data representing a third article of clothing, wherein the third article of clothing is associated with the first clothing category; determining a second visual feature vector of third image data representing a fourth article of clothing, wherein the fourth article of clothing is associated with the first clothing category; determining a first distance between the first visual feature vector and the first output feature vector; determining a second distance between the second visual feature vector and the first output feature vector, the second distance being greater than the first distance; generating a second state vector based on the first state vector and the second image data; receiving, by the computing device, data representing a second clothing category; determining, by the computing device, a third visual feature vector of fourth image data representing a fifth article of clothing based at least in part on the first state vector and the second state vector, wherein the fifth article of clothing is associated with the second clothing category; and outputting, by the computing device, the fourth image data.
 11. The computing device of claim 10, wherein generating the first output feature vector comprises using a long short-term memory (LSTM) network of the computing device to generate the first output feature vector, wherein the instructions, when executed by the at least one processor are effective to cause the at least one processor to perform the method further comprising: generating, by the LSTM network of the computing device, the second state vector, wherein the second state vector represents the outfit comprising at least the first article of clothing and the second article of clothing.
 12. The computing device of claim 10, wherein the first clothing category comprises a next clothing category requested for recommendation by the computing device.
 13. The computing device of claim 10, wherein the second article of clothing is of the first clothing category and wherein the data representing the first clothing category comprises a category vector representing the first clothing category.
 14. The computing device of claim 10, wherein the instructions, when executed by the at least one processor are effective to cause the at least one processor to perform the method further comprising: providing the first image data to a visual feature extractor function; and generating, by the visual feature extractor function, an input feature vector representing the first image data, wherein the first output feature vector is generated further based on the input feature vector.
 15. The computing device of claim 14, wherein the instructions, when executed by the at least one processor are effective to cause the at least one processor to perform the method further comprising: concatenating the input feature vector and a category vector representing the first clothing category to generate a concatenated input vector; and providing the concatenated input vector to a recurrent neural network, wherein the first output feature vector is generated based on the concatenated input vector and the first state vector.
 16. The computing device of claim 10, wherein the instructions, when executed by the at least one processor are effective to cause the at least one processor to perform the method further comprising: determining respective Euclidean distances between the first output feature vector and each of a plurality of other visual feature vectors, wherein each of the plurality of other visual feature vectors represents an image of a different article of clothing of the first clothing category; and generating a ranked list of images of articles of clothing of the first clothing category in ascending order of the respective Euclidean distances.
 17. The computing device of claim 10, wherein generating the first output feature vector comprises using an order invariant long short-term memory (LSTM) network of the computing device to generate the first output feature vector. 